#include<iostream>
using namespace std;
class A
{
	int _A = 0;
protected:
	int _a = 1;
};
class B :public A
{
public:
	void show()
	{
		cout << _a << endl;
		//cout << _A << endl;
	}
};
int main()
{
	B b;
	b.show();
	return 0;
}